UL 497C
UL 497C
UL 497C requirements cover protectors for use on coaxial cable circuits. This standard
covers construction and performance requirements.
UL 497C Construction and Performance Requirements
The “Construction” section covers the following requirements:
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General
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Corrosion Protection
Field-wiring Connections
Components
Spacing
Enclosures
The “Performance” section covers the following requirements:
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General
I2t Limiting
Abnormal Sustained Current
Component Temperature Test
Breakdown Voltage Measurement
Impulse Spark-over Voltage Measurement
Limited Short-circuit Test
High Current Ground Path Test
Cable Shield Fuse Test
Endurance Conditioning Test
Induced Low Current Test
Distortion Test
Flame Test
Impact Test (Polymeric Enclosures)
Jarring Test
Water Spray Test
Leakage Current Test
Dielectric Voltage-withstand Test
Ultraviolet Light and Water Exposure
Tensile Strength and Elongation Tests
Air Oven Aging
Ozone Exposure
Performance Requirements Specific to SIDACtor Devices
1. Strike Voltage Breakdown Test — Protectors are required to break down within ±25% of
the manufacturer’s specified breakdown range but no higher than 750 V at ? 2 kV/s rise
time.
2. Endurance Conditioning — Protectors are subjected to 500 impulse cycles. Each cycle is
a 1000 V peak, 10 A, 10x1000 µs pulse. Pulses are applied in one polarity at 10-second
intervals and then repeated in the opposite polarity. Then, 100 cycles of 1000 V peak,
100 A, 10x1000 µs pulse are applied to three new protectors. Finally, two cycles of
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© 2002 Teccor Electronics
SIDACtor Data Book and Design Guide
®
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